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FDI
PCA9633DEMO
User Manual
FDI
Switch Layout
Switch
1
2
3
4
5
6
7
8
Function
Board Address 0
1<>0
Board Address 1
1<>0
Board Address 2
1<>0
Cable LED OEn
N<>Y
Bus SDA Pull-up Enable N<>Y
Bus SCL Pull-up Enable N<>Y
Cable Power Off/On Off/On
Board Power Off/On Off/On
Description
Board Address input to CPU and PCA9633
Board Address input to CPU and PCA9633
Board Address input to CPU and PCA9633
Connect the OEn of the PCA9633 to the cable
Enable Pull-up of the SDA signal on the cable
Enable Pull-up of the SCL signal on the cable
Connect the battery to the cable
Board power control
Switch Details
Board Address
SW3
ON
SW2 SW1
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
OFF
OFF
ON
ON
OFF
OFF
OFF
ON
OFF
ON
OFF
ON
OFF
Board Description
0
Master (default)
1
2
3
4
5
6
7
Notes
There must be one and only
one master board set
Slave 1
Slave 2
Slave 3
Slave 4
Slave 5
Slave 6
Slave 7
The MASTER board should be at one end of the Ethernet cable for proper operation of
the I²C-bus. Subsequent SLAVE boards are not required to be in any certain order. Also,
there may be gaps in the SLAVE board addresses (e.g., it is possible to have SLAVE
Boards 2, 4, 6 and no SLAVE Board 3 or 5).
Cable LED OEn
This switch connects the OEn of the PCA9633 to pin 6 of RJ45 cable so that the master
board can control the PCA9633 /OE pin on each slave board. This MUST be set to ON
for proper operation.
H:\Philips\PCA9633DEMO\DOCs\PCA9633 Demo Board User Manual
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